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The net is closing on many criminals who have so far got away with it. Dozens of cold cases will be solved in 2019, as detectives tap DNA data used for tracing family trees.
The potential of this resource has only recently been discovered. In April, police in California arrested a new suspect in the case of the Golden State Killer, who raped and murdered people in the 1970s and 80s. They identified a man using a website called GEDmatch that helps people use DNA test results from services like 23andMe and AncestryDNA to …